Study target country (7)
I believe the answer is:
denmark
'country' is the definition.
(I know that Denmark is a country)
'study target' is the wordplay.
'study' becomes 'den' (term for a study or office).
'target' becomes 'mark' (synonyms).
'den'+'mark'='DENMARK'
(Other definitions for denmark that I've seen before include "Copenhagen its capital" , "EU member" , "Monarchy, a member of the European Union" , "Aarhus is its second-largest city" , "North European country" .)